Filter cassette



FIG. 1 is a top isometric view of a filter cassette incorporating thenew design;

FIG. 2 is a bottom isometric view of FIG. 1;

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a rear view of FIG. 1;

FIG. 5 is a top view of FIG. 1;

FIG. 6 is a bottom view of FIG. 1;

FIG. 7 is a left side view of FIG. 1; and,

FIG. 8 is a right side view of FIG. 1.

CLAIM The ornamental design for a filter cassette, as shown anddescribed.